Merge master.kernel.org:/home/rmk/linux-2.6-arm

[linux-2.6] / drivers / base / dd.c

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 3b419c9a1e7e6d407a8b3a5ad26440534c499a7b..2b905016664d9779439c4fa047507256b0cb2faf 100644 (file)
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -65,7 +65,8 @@ void device_bind_driver(struct device * dev)
  *     This function returns 1 if a match is found, an error if one
  *     occurs (that is not -ENODEV or -ENXIO), and 0 otherwise.
  *
- *     This function must be called with @dev->sem held.
+ *     This function must be called with @dev->sem held.  When called
+ *     for a USB interface, @dev->parent->sem must be held as well.
  */
 int driver_probe_device(struct device_driver * drv, struct device * dev)
 {
@@ -123,6 +124,8 @@ static int __device_attach(struct device_driver * drv, void * data)
  *
  *     Returns 1 if the device was bound to a driver;
  *     0 if no matching device was found; error code otherwise.
+ *
+ *     When called for a USB interface, @dev->parent->sem must be held.
  */
 int device_attach(struct device * dev)
 {
@@ -152,10 +155,14 @@ static int __driver_attach(struct device * dev, void * data)
         * is an error.
         */
 
+       if (dev->parent)        /* Needed for USB */
+               down(&dev->parent->sem);
        down(&dev->sem);
        if (!dev->driver)
                driver_probe_device(drv, dev);
        up(&dev->sem);
+       if (dev->parent)
+               up(&dev->parent->sem);
 
        return 0;
 }
@@ -181,6 +188,8 @@ void driver_attach(struct device_driver * drv)
  *     Manually detach device from driver.
  *
  *     __device_release_driver() must be called with @dev->sem held.
+ *     When called for a USB interface, @dev->parent->sem must be held
+ *     as well.
  */
 
 static void __device_release_driver(struct device * dev)
@@ -233,10 +242,14 @@ void driver_detach(struct device_driver * drv)
                get_device(dev);
                spin_unlock(&drv->klist_devices.k_lock);
 
+               if (dev->parent)        /* Needed for USB */
+                       down(&dev->parent->sem);
                down(&dev->sem);
                if (dev->driver == drv)
                        __device_release_driver(dev);
                up(&dev->sem);
+               if (dev->parent)
+                       up(&dev->parent->sem);
                put_device(dev);
        }
 }